Paul (Rufus Sewell) and his wife, Jeanne (Emmanuelle Béart) are a wealthy couple that have their lives turned upside down when, in Thailand, they lose their son, Joshua, in the Boxing Day Christmas tsunami of 2004.

Although the boy is presumed dead, Jeanne believes he may still be out there, since his body has not been identified. When the couple sees a film at an orphanage fund-raiser made by Kimberly Park, just back from the Andaman Coast, of Moken and Salone natives in the South Tanintharyi division. A restricted area only accessible by boats through a triad of Thaksin Gao who has military ties that smuggles girls to bars in Myanmar. Jeanne sees a vague figure in the distance she believes to be Josh., After that, they hire a shady Thai man (Petch Osathanugrah) to take them into the city's underbelly and lead them to their son's possible kidnapper.

Their search takes them to the dangerous Thai-Burmese waters, and then into the jungle, where they face unknown but horrifying dangers.

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